Do you think that you know who can be trusted and who cannot? Are you sure that you know the difference between good and evil? Do you think that a crime is always a crime? You are wrong! The director of an elite school receives a mysterious package - and a few hours later he is found hanged in the school assembly hall. Thus begins a series of sophisticated murders that have turned the quiet English city of Exeter into hell. Experienced detectives Imogen Gray and Adrian Miles, charged with the investigation, are trying to clarify the motives of the mysterious criminal. Little do they know that soon they will have to ask themselves an unexpected question: does he really need to be stopped?..